Ax P 1961 (citation)- p 15 notes fibrillar muscle elements in. Beklemischev VN 1963 (citation)- p 241 epidermis cellular in young, syncytial in old. An der Lan H 1964 [??]- discription of acoel he found in Donau region of Germany. He says is O. erythrophthalmus from ? Europe- a relict species- discussion of possible history. Ax P, Doerjes J 1966 (citation)- include this species in discussion of the genus- in key and table. Steinbock O 1966 (citation)- note on cells in p 68 (cellular versus syncytial). Dorjes J 1968 (citation)- notes problem in genus and this species- p 89 lists only. Beklemischev VN 1969 (citation)- mentions and illustration of epidermis in p 35, myofibrils in p 249.
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